Checking for an empty QUERY_STRING ?

[AdamBrunt Profile]

Hi all,

I am trying to write a rule whereby if a URL has an & character in it then it must also have a preceding question mark.

My current, non-working, attempt is:

Code: Select all

RewriteCond %{QUERY_STRING} ^$
RewriteRule (^[^\&]+)\&(.+) xxxxxxxxxxxxxxxx$1?$2 [RP,I,L]


Which, I thought, only does the rule if the query string is empty but it doesn't seem to work.

Has anyone got any ideas what the issue is with my RewriteCond ? Or maybe have a better solution for what I am trying to do ?

Regards,

Adam Brunt

[Anton]

Hello, Adam

First, please clarify if you are using v2 or v3.

The rule for v2 should look like:

RewriteRule ([^&]+)&(.+) $1\?$2 [RP]

[AdamBrunt Profile]

Hi Anton,

I can't be certain but the according to the documentation.html file in (C:\Program Files\Helicon\ISAPI_Rewrite\Help) it is "ISAPI_Rewrite 2".

So, should my rule be:

Code: Select all

RewriteCond %{QUERY_STRING} ^$
RewriteRule ([^&]+)&(.+) $1\?$2 [RP]


Or do I not need the RewriteCond ?

UPDATE: That seems to work but it also means that if there is already a ? in the URL then there will now be two. However, if I use:

Code: Select all

RewriteRule ([^&\?]+)&(.+) $1\?$2 [RP,I,L]


then it seems to work correctly. Which seems to suggest the RewriteCond is not required ?

[Anton]

Hello,

You don't need to use RewriteCond %{QUERY_STRING} in ISAPI_Rewrite 2, it's only for v3 syntax.
Your rule looks just fine.